Sewing-machine.



H. DREIST.

SEWING MAGHINE.

APPLICATION FILED JAN. 29, 1906.

935,145. Patented Sept.28,1909i 2 SHEETS-SHEET l.

Annnzw. a Grimm cc" mom umnaamnl, WASHIKRYON, n. c.

H. DREIST.

SEWING MACHINE. APPLIGATION FILED JAN. 29, 1906.

Patented Sept. 28, 1909.

2 sums-4mm 2.

ZrnJT/TOT.

I Wifiveum mm, L. 0mm 00. "mo-mum. wmummomm. c.

UNITED srarns PATENT @FFTQEEL HANS DREIST, OF BRESLAU, GERMANY.

SEWING-MACHINE.

Specification of Letters Patent.

Patented Sept. 28, 1909.

Application filed January 29, 1906. Serial No. 298,456.

To all whom "it may concern: Be it known that I, HANs DREIST, a sub ectof the German Emperor, residing at} Breslau, in Germany, have inventedcertain I new and useful Improvements in Sewing Machines, of which thefollowing is a specification.

The present invention relates to an improved machine for sewing leatheror the like, more particularly for sewing leathern i driving-belts.

The machine is illustrated in the annexed drawing in which Figure l is afront-view and Fig. 2 a vertical section on the line AA of Fig. 1. Figs.3, l, 5 and 6 illustrate details.

The machine comprises two standards or pillars Z) fixed to a base orpedestal a each of the said pillars having a vertical groove 01'slide-way c for two slide-blocks (Z and c situated one above the other.The lower ends of the blocks (Z and the upper ends of the blocks a areconnected with each other by cross-bars f and g respectively, the latterbeing provided with vertical tubular projections h and 71 serving asholders for needles m which are pointed at both ends and fit intosuitable blocks arranged in the said holders.

The belt Z is adapted to be conducted between the holders by means ofrollers k. The two guides c for the blocks d 'and c are of such lengththat when the block at is in its lowest position and the block 6 in itshigh- I est position the needles m are engaged by adjacent holders h and2'.

For reciprocating the cross-bars f and g racks n and 0 fixed to the barscl and e are provided which racks can be moved upward and downward bymeans of pinions al e operated by bevel-gear p g from shafts p gcarrying hand wheels 79 9 within easy reach of the attendant. At thecenter of each needle a recess 7* is provided and above and below thelatter there are eyes .9. The recesses r serve for fastening to theneedles the leathern thread 2 by means of which the belt or the like isto be sewn, the said thread being preferably provided with pointed ends.The eyes 8 serve for fixing the needles alternately to the holders h and2' during the sewing operation.

The position of rest of the holders 2' is indicated in the drawing bysolid lines, the holders h being then in the position indicated bydotted lines both the cross-bars being, therefore in their highestpositions. The needles are, in this position, engaged by the holders h,in which they are secured by means of rods 25 fixed to a horizontallyinevable spring actuated bar a and adapted to enter lateral aperturesprovided in the holders. A similar spring-actuated bar 1), with rodsfixed thereto, is provided for engaging the needles when the latterenter the holders The rods 25 also serve the purpose of supporting thespring actuated bars a and 'u, said rods .in turn being slidablysupported at one end by brackets t connected to the holders l1. and 2'and at the other end by the holders themselves.

When the belt to be sewn is inserted between the rollers ]c, and theholders h with the needles therein are moved from their upper to theirlower position the needles perforate the belt and enter the holders i.

In order to draw the thread connected with the needles downward throughthe bolt the needles must be disengaged from the holders h and securedat the same time to the holders This is effected by means of a pair ofslides 'w adapted to be moved vertically along the pillars Z) by meansof a lever to and each provided with two converging surfaces a; and 2against which the bars a and o are pressed by means of their springs, sothat when the slides provided with the said surfaces are moved upward ordownward one of the said bars is moved toward the holders and the otheris moved backward. The said converging surfaces 00 and y are preferablyformed by cutting out a V-shaped portion from the slides w and thenbending the edges of the V-shaped portion inwardly at right angles tothe surface of the slide, as clearly shown at 00 in Fig. 4. The slides10 are guided by pins to and slots 10 The hand lever w is fixed on ashaft Q02 carrying at the opposite end an arm e0 Links w w connect thelever to and arm 10 to pins 10 10 extending from the slides w e0respectively.

With the parts in the position indicated in Figs. 3 and t by solid linesthe needles have perforated the belt but are still secured to the upperholders and not yet fixed to the lower holders. When, however, theinclined surface 00 is moved into the position inclicated in Fig. 3 bydotted lines the bar u is so moved that the rods 25 fixed thereto arewithdrawn from the holders it, that is to say from the upper eyes of theneedles. At

is thereupon moved downward so that, the,

thread a is drawn through the belt. The

latter is then moved forward through a dis- 1 tance corresponding to thelength of one stitch, and the sewing action is repeated by moving theparts in the opposite direction, that is to say cross-bar g is movedupward so that the upper points of the needles perforate the belt andenter the holders h in which they are automatically engaged while beingdisengaged from the holders i. In order to prevent breaking of theleathern threads, which are usually not of perfectly uniform length, theneedle-holders are' supported by springs g has shown in Figs. 2 and 8.

It may be mentioned that the needles m can also be used for sewingleathern driving belts and the like by hand.

hat I claim as my invention and desire to secure by Letters Patent ofthe United States is 1. In a sewing machine the combination of two crossbars each carrying a plurality of needle receiving sockets between whichbars the material is fed, double pointed needles adapted to be carriedby said sockets, and means whereby the said needles are caused to besecured in and released from each series of socket-s alternately for thepurpose set forth.

2. In a sewing machine the combination of a frame, two cross bars eachcarrying a plurality of needle receiving sockets mounted therein betweenwhich bars the material is fed, means for imparting vertical movement tosaid bars double pointed needles adapted to be carried by said socketsand each provided with two perforations, and spring actuated rodsadapted to be engaged in and released from said perforations to securethe needles in the sockets of the one or other bar alternately for thepurpose set forth.

8. In a machine for sewing leather the combination of a frame, a pair ofbars mounted therein between which the material is fed, means forimparting vertical movement to said bars, a plurality of needle holderscarried by each of said bars, double pointed needles adapted to becarried by said holders said needles having a perforation adjacent eachend, spring actuated rods adapted to engage the perforations in theneedles and means comprising a hand operated slide with inclined facesfor operating said rods whereby the needles are secured in and releasedfrom the holders of each of the bars alternately for the purpose setforth.

4. In a sewing machine the'combination of a frame, a pair of barsmounted therein between which the material is fed, racks for impartingvertical movement to said bars, p'inions engaging said racks, handwheels, shafts and beveled gear for the separate operation of said*pi-nions perforated needle holders carried by said bars, double pointedneedles adapted to be carried by said holders and having a perforationadjacent each end, rods adapted to el'lgage the perforations in theneedles and needle holders to lock the needles in the latter, springactuated bars adapted to act on said rods, and a slide having inclinedsurfaces acting on said bars whereby the needles are secured in andreleased from the holders of each of the needle bars alternately for thepurpose set forth.

In witness whereof I have signed this specification in the presence oftwo witnesses.

HANS DREIST.

Witnesses CARL SCHAND, O'rro NICKEL.

